Java – String Reverse Example

public class StringReverseExample {
   public static void main(String[] args) {
      String string = "abcdef";
      String reverse = new StringBuffer(string).
      reverse().toString();
      System.out.println("\nString before reverse:"+string);
      System.out.println("String after reverse:"+reverse);
   }
}

Java – Convert String to Long

public class StringToLong {

	public static void main(String args[]) {
		String strLong = "2323232";

		//Convert String to long using Long.valueOf(),better because
		//it can cache frequently used long values
		long number = Long.valueOf(strLong);
		System.out.println("String to long conversion using valueOf :" + number);

		//Convert String to long in Java using java.lang.Long object
		strLong ="4444444444444444444";
		Long numberObject = new Long(strLong);
		number = numberObject; //auto boxing will take care of long to Long conversion
		System.out.println("String to long conversion example using Long object: " + number);

		//Convert String to long with Long.parseLong method in Java
		strLong="999999999999999999";
		Long parsedLong = Long.parseLong(strLong) ;
		number = parsedLong; //auto-boxing will convert Long object to primitive long
		System.out.println("String to long conversion using parseLong() method: " + number);

		//Convert String to long using Long.decode() method in Java
		strLong = "-1023454";
		number = Long.decode(strLong);
		System.out.println("String to long conversion using decode() method: " + number);

		//String to long in hexadecimal format
		strLong = "0xFFFF";
		number = Long.decode(strLong);
		System.out.println("String to long example in hex format decode() method: " + number);

		//String to long in octal format
		strLong = "0777";
		number = Long.decode(strLong);
		System.out.println("String to long example in octal format decode() method: " + number);
	}
}

Output:

String to long conversion using valueOf :2323232
String to long conversion example using Long object: 4444444444444444444
String to long conversion using parseLong() method: 999999999999999999
String to long conversion using decode() method: -1023454
String to long example in hex format decode() method: 65535
String to long example in octal format decode() method: 511

Java – Convert String to InputStream

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class StringToInputStreamExample {

	public static void main(String[] args) throws IOException {
		String str = "This is a String ~ GoGoGo";

		// convert String into InputStream
		InputStream is = new ByteArrayInputStream(str.getBytes());

		// read it with BufferedReader
		BufferedReader br = new BufferedReader(new InputStreamReader(is));

		String line;
		while ((line = br.readLine()) != null) {
			System.out.println(line);
		}

		br.close();
	}

}

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